eve

..We have used GAL4-directed transcription to expand the domain of embryonic expression of the homeobox protein even-skipped...

..We sequenced the even-skipped locus from six species of scavenger flies (Sepsidae) that are highly diverged from the model species ..

..their recognition sites are not unambiguously more constrained evolutionarily than the immediate flanking DNA, even in more highly bound and presumably functional regions, indicating that comparative DNA sequence analysis is ..

We report findings on naturally occurring variation in the regulatory region of even-skipped in Drosophila...

..Taken together, these results show that interactions between sanpodo, the Notch signaling pathway and numb enable CNS sibling neurons to acquire different fates...

..We also show that compression of the fate map does not appear to be repaired by the induction of new cell divisions. In addition, some tissues are more sensitive to fate map compression than others...

..We have identified the regulatory sequences required for the periodic expression of the Drosophila pair rule gene even skipped (eve)...

..We also propose that in wg-expressing ectodermal cells, slp is an integral component in an autocrine feedback loop of Wg signaling...

..By the end of the fourteenth nuclear division cycle, the stripes of the pair-rule gene even-skipped (eve) sharpen and polarize, a process that is essential for the precisely localized expression of segment ..

..may be defined by the overlapping expression of the head gap gene buttonhead (btd) and the primary pair-rule gene even-skipped (eve)...

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..The results highlight the importance of genetic analysis in the study of proteins required for developmental regulation of gene expression...

..Numb acts to block Notch-mediated repression of genes expressed in muscle progenitor cells. Thus asymmetric cell divisions are essential determinants of muscle fates during myogenesis in Drosophila..

..One of these groups corresponds to even-skipped, the other 12 are previously unidentified...

..Analysis of cell cycle regulators indicates that the PcG system also dynamically modulates the expression levels of certain genes, providing a possible explanation for the tumor phenotype of PcG mutants...

..Moreover, our data suggest that the fate of some sibling neurons may be regulated by signals that do not require lateral interaction between the sibling cells...

..By comparing findings from Caenorhabditis elegans, Drosophila and vertebrate model systems, it is apparent that both evolutionarily conserved and non-conserved mechanisms are used...

During segmentation of the Drosophila embryo, even skipped is required to activate engrailed stripes and to organize odd-numbered parasegments...

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..Genetic studies suggested that even-skipped (eve) stripe 2 is controlled by three gap genes, hunchback (hb), Kruppel (Kr), and giant (gt), and by the ..

b>even-skipped (eve) is a homeodomain-encoding gene that is a genetically defined repressor of Ultrabithorax (Ubx), fushi-tarazu (ftz), and wingless (wg)...

The pair-rule gene even-skipped (eve) plays a key role in the regulatory hierarchy governing segmentation in Drosophila...

..Therefore, it has not been tested explicitly whether a temporally stable Bicoid gradient prior to cellularization is required for precise patterning...

..We propose that PON is one component of a multimolecular machinery that localizes Numb by responding to polarity cues conserved in neural precursors and epithelial cells...

..To model and thoroughly understand animal transcription networks, it is essential to derive accurate spatial and temporal descriptions of developing gene expression patterns with cellular resolution...

..Using the Fasciclin2-based mapping procedure as a standard (e.g., in a common database) would facilitate studies on the functional architecture of the neuropile and the identification of candiate circuit elements...

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..Here, we show that zfh-1 is specifically required for formation of the even-skipped (eve)-expressing subset of pericardial cells (EPCs), without affecting the formation of their siblings, the ..

..that the concomitant loss of rhomboid and vein yield CNS phenotypes indistinguishable from DER mutant embryos, even though loss of either gene alone yields minor CNS phenotypes...

..Antigenicity of the purified recombinant proteins may be increased by precipitation in double-distilled water. The results of using the serums obtained for fluorescent staining of Drosophila embryos are shown...

..We present a VirtualEmbryo containing data for 95 genes at six time cohorts. We show that known gene-regulatory interactions can be automatically recovered from this data set and predict hundreds of new interactions...

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..A model is emerging, although slowly, for the way that arthropod segmentation mechanisms have evolved...

..This mechanism appears to be responsible for specifying NB5-3 identity to a row 5 neuroblast and preventing Wg from specifying NB4-2 identity to that cell...

..of activating and repressing transcription factors work together to confine the expression of the homeobox gene even-skipped (eve) to a small region of the dorsal mesoderm...

..Finally, our models suggest a correlation between timing of gap domain boundary formation and regulatory contributions from the terminal maternal system...

..Thus, this work demonstrates that Nkx6 acts in a specific neuronal population to link neuronal subtype identity to neuronal morphology and connectivity...

..We also discuss the definition of true binding sites and the possible biological principles that govern patterning of regulatory regions and the distribution of transcriptional signals...

..Transplantation assays of rols mutant mesodermal cells into wild-type embryos show that Rols is required in muscle precursor cells and is essential to recruit fusion-competent myoblasts for myotube formation...

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..This method provides high-throughput quantification at cellular resolution...

..The integration of Pointed with the combinatorial effects of dTCF, Mad, Twist, and Tinman determines inductive Ras signaling specificity in muscle and heart development...

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..These failures in precise transcriptional control demonstrate the importance of cooperative DNA binding for embryonic patterning in vivo...

..The even-skipped stripe 2 element controls the expression of the second transverse stripe of even-skipped messenger RNA in ..

..Unexpectedly, we found that the cells that expressed TeTxLC, which were themselves incapable of evoked release, showed a dramatic reduction in synaptic input. We detected this reduction both electrophysiologically and ultrastructurally...

..The former permit enhancer autonomy in modular promoters, whereas the latter function in a dominant fashion to silence multiple enhancers...

..Loss of wingless results in the absence or duplication of identified neuroblasts, highlighting its role in generating neuroblast diversity in the CNS...

Previous studies have provided a detailed model for the regulation of even-skipped (eve) stripe 2 expression in the Drosophila embryo...

..proximal upstream elements by the striped expression of other pair-rule genes, while others, such as hairy and eve, are largely regulated through distal upstream elements by the aperiodic gap genes (Figure 7)...

..The limited expressivity observed suggests that Toll is only one of several genes required for proper motoneuron and muscle specification...

..Furthermore, the seven ftz stripes are correctly established in embryos carrying mutations in h, eve or runt, with normal expression patterns decaying only after cellularization...

..These results set the stage for investigating neuroblast specification and the mechanisms controlling neuroblast cell lineages...

Previous studies on the regulation of the segmentation gene even-skipped (eve) have centered on the transcription of stripe 2...

..heat-shock promoter caused stripe-specific defects in the expression patterns of the pair-rule genes hairy and even-skipped but had a more uniform effect on the secondary pair-rule gene fushi tarazu...

..and repressors specify sharp stripes of gene expression in the early embryo, we have conducted a detailed study of even-skipped (eve) stripe 2...

..To these ends, we demonstrate that the presence of SNS-expressing cells is absolutely dependent on Notch, and that expression of SNS does not require the myogenic regulatory protein MEF2...

..Genetic interactions and the strikingly similar phenotypes of mutations in shn and the dpp receptors encoded by thick veins and punt suggest that shn plays a downstream role in dpp signaling...

..In the case of the segmentation gene even-skipped (eve), autoregulation is important for the specification of sharp stripes of gene expression at the onset ..

..This suggests that loco and pros are targets of DRI transcriptional activation in some LG. We conclude that dri is an important regulator of the late development of longitudinal glia...

..We find that although localisation of wingless transcripts is conserved in Diptera, localisation of even-skipped and hairy pair-rule transcripts is evolutionarily labile and correlates with taxon-specific changes in ..

..These results confirm that proper pathway formation requires careful regulation of MLCK and/or myosin II activity and suggest that regulation occurs in direct response to attractive and repulsive cues...

..Nuclear compartments may also be involved in the post-translational modification of proteins by sumoylation and ubiquitylation...

..Our findings suggest a model in which Numb inhibits Notch signaling through the regulation of Sanpodo membrane localization...

..Additionally, our analysis identified a gene, pimples, that is required for the proper completion of mitosis in the post-blastoderm divisions of the embryo...

..Our results indicate that both genes are required for the normal development of this lineage and that the two collaborate during the specification of GMC-1 identity...

..None of these five known gap genes are required for the activation of the labral segment domains of hh and wg, which are presumably either activated directly by maternal pathways or by an unidentified gap gene...

..We further show that Prd contains two DNA binding activities. The Prd homeodomain is responsible for one of them while the other is not dependent on the recognition helix...

..But disruption of ACER, a Drosophila ACE2 homologue, results in a severe defect of heart morphogenesis. These genetic data for ACE2 show that it is an essential regulator of heart function in vivo...

..We propose that this intrinsic complexity of the HD, as well as its frequent association with other DNA binding domains, explains the functional specificity achieved by genes encoding highly related HDs...

..These structural properties provide a molecular mechanism to explain the synergistic and antagonistic functional relations among the HLH encoding genes that control several developmental pathways...

..Loss of pros function results in aberrant expression of the homeobox genes fushi tarazu, even-skipped and engrailed in a subset of neuroblast progeny, suggesting that pros plays an early and fundamental role ..

..Similar defects are seen in lethal giant larvae (lgl) mutants where Brat and Prospero are not asymmetric. We have identified a molecular mechanism that may control self-renewal and prevent tumor formation in other stem cells as well...

..Teneurin function appears to be required for a fundamentally important signaling mechanism conserved between invertebrates and vertebrates having an impact on many processes relying on cell-cell contact throughout development...

..The insert in the RpL13A coding region creates a classic Minute mutation which enhances Notch pathway wing phenotypes. This report adds RpL13A to the list of Drosophila ribosomal protein genes that cause Minute phenotypes when mutated...

..activity is required for the formation of all myocardial and pericardial cell types, with the exception of the Eve-positive pericardial cells...

..We discuss the transcriptional mechanism which causes ftz to be expressed in a seven stripe pattern during embryogenesis...

..Our results suggest that two classes of asymmetric cell division exist, each with different requirements for asymmetric inheritance of cell-fate determinants...

The pair-rule genes hairy, runt, even-skipped, and fushi tarazu express their mRNAs and proteins in striped patterns in the Drosophila embryo at the blastoderm stage...

..Overexpression of fish or fly Nkx6 is sufficient to generate supernumerary motoneurons in both zebrafish and flies. These results suggest that one ancestral function of Nkx6 proteins was to promote motoneuron development...

..Recent results suggest that the Drosophila transcriptional activator known as GAGA factor functions by influencing chromatin structure...

..Such complexes, which normally regulate the expression of many genes, including the homeotic loci, are responsible for silencing, white gene variegation, pairing-dependent effects and insertional targeting...

..Our results suggest that developmental induction of Slam organizes the polarized growth of membrane via the recruitment of membrane-targeting proteins at adherens junctions...

..for instance there are segmentally arranged clusters of cells (some of which are heart precursors) that express even-skipped. Expression of even-skipped depends on Wingless, a secreted molecule...

..The analysis of chromatin boundary elements suggest that silencers and enhancers might work through distinct mechanisms. We speculate that silencers constrain the evolution of complex promoters...

..We suggest a model in which the promoter DNA is wrapped around a GAGA multimer in a conformation that may exclude normal nucleosome formation...

..Since the penetrance of the CNS phenotypes is not complete in double mutants, additional components that allow some degree of Wg signaling must exist in vivo...

..Based on these results, and the segmental phenotypes generated by ectopic Odd, we suggest a number of new roles for Odd in the patterning of embryonic segments. These include gap-, pair-rule- and segment polarity-type functions...

..We propose that COMM is an essential part of the dynamic cell surface remodeling needed by postsynaptic cells in coordinating synaptogenesis initiation...

..The muscle phenotype shows deletions as well as duplication of specific muscles which is reflected in a change of even-skipped (eve) and Krüppel (Kr) expressing cells...

..This process raises intriguing questions about the control of embryonic polarity and segmentation...

..Finally, we identify a novel pathway mediated by the gap gene huckebein through which three maternal systems cooperate to repress otd expression at the anterior terminus of the embryo...

..We conclude that fas encodes a protein that, in the developing nervous system, is present on the surface of neurons and is essential for nerve cell migration and the establishment of axonal pathways...

..Finally, parallels between requirements for FGFR signaling in Drosophila and vertebrate mesoderm development are considered...

..Comparison of the predictions with recent experimental evidence suggests that the competitive binding model more accurately reflects certain features of the Ubx expression pattern--features not predicted by the genetic model...

..These reports identity additional genes and genetic circuitry necessary for this patterning system, and they highlight variations that might reflect developmental constraints within individual target cell fields...

..The related GATA4 protein of mice likewise functions as a cardiogenic factor in Drosophila, demonstrating an evolutionarily conserved function between Pannier and GATA4 in heart development...

..2 target genes. This knowledge may be highly instructive in defining those regulatory networks required for beta islet specification. ..

..These studies address the structure and function of vnd, a critical regulator of early neuronal development, and may serve as a prototype for vertebrate vnd-like genes. ..

..129 ES lines maintain self-renewal under a wide range of conditions even in absence of mouse embryonic fibroblast (MEF) feeders if supplied with Bone Morphogenetic Protein (BMP) and ..

..5. .Determine the transcriptional effect and understand the mechanism of H3K27 methylation and H2A ubiquitylation using a reconstituted chromatin transcription system. More description in proposal. ..

..Together, these studies will further our understanding of the regulatory circuits that control gastrointestinal proliferation in normal development and carcinogenesis. ..

..Thus, we propose to continue our investigation of temporal patterning in the Drosophila CMS,with the goal of providing insight into the mechanisms regulating temporal patterning during mammalian neurogenesis. ..

..The new resources generated through this project will be made available to the NIDDK-funded biotechnology centers and the diabetes research community at large. ..

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..Our goal is to elucidate the genetic basis of these diseases using the genetic model system Drosophila. Polygenic interactive genes identified in this project will directly provide new candidates for human heart disease genes. ..

..Such insight should help us understand the etiology of diseases in which this process is de-regulated and design new methods to treat these diseases. ..

..5. .Determine the transcriptional effect and understand the mechanism of H3K27 methylation and H2A ubiquitylation using a reconstituted chromatin transcription system. More description in proposal. ..

..Our proposed studies will help reveal mechanisms that regulate motoneuron differentiation and survival, thus providing insights that should facilitate new therapies for treatment of motoneuron diseases and injury. ..

..Such insight should help us understand the etiology of diseases in which this process is de-regulated and design new methods to treat these diseases. ..

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..Thus, we propose to continue our investigation of temporal patterning in the Drosophila CNS, with the goal of providing insight into the mechanisms regulating temporal patterning during mammalian neurogenesis. ..

..Our proposed studies will provide insights that should facilitate new therapies for treatment of motoneuron diseases and injury. ..

..Our proposed studies will harness the knowledge gained from the study of the viral oncoprotein E1A to unravel potential new mechanisms governing oncogenesis and suggest strategies to inhibit the process in humans. ..

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..the cytoplasmic factors encoded by numb and sanpodo and the nuclear transcription factors encoded by zfh-1 and evenskipped, (3) to determine if a recently isolated mouse zfh-1 gene is part of a new conserved gene family that plays a ..

..We will learn whether death of a specific motoneuron can be prevented, and we will learn its fate when it survives. We will learn whether motoneurons that do not typically behave as an equivalence pair can be induced to do so...

..Since 175R T antigen is also localized on the nuclear envelope, we will investigate whether this protein could play a role in the nucleocytoplasmic transport of RNA via enhanced nucleoside triphophatase activity...

..We will do RNA and protein localization studies; our collaborator, Dr. G. Oliver will generate and assay the gene knock-out mice. ..

..Together, these studies will further our understanding of the regulatory circuits that control gastrointestinal proliferation in normal development and carcinogenesis. ..

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..It will also allow the recovery of mutations without any selection based upon phenotype. Finally, this technology should ultimately be applicable to other model genetic organisms as well as to Drosophila. ..

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..Together, this proposal will further our understanding of GI development and cancer, and allow for the development of novel diagnostic and possibly therapeutic tools in the future. ..

..Our results may also provide the experimental support to suggest that BNIP3 may be a new prognostic marker for human cancer. ..